CN111678120B - Control method for joint start of steam feed pump and trip electric pump of 330MW subcritical unit - Google Patents
Control method for joint start of steam feed pump and trip electric pump of 330MW subcritical unit Download PDFInfo
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- CN111678120B CN111678120B CN202010491694.9A CN202010491694A CN111678120B CN 111678120 B CN111678120 B CN 111678120B CN 202010491694 A CN202010491694 A CN 202010491694A CN 111678120 B CN111678120 B CN 111678120B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
A control method for joint starting of a steam feed pump and a tripping electric pump of a 330MW subcritical unit relates to the technical field of control of a generator set. The invention aims to solve the problems that the control of the water level of the boiler of the existing generator set can not realize the correct interlocking starting of the standby electric pump, or the spoon position of the standby electric pump after the interlocking can not correctly perform automatic tracking. When the main steam flow of the unit is less than or equal to 660t/h, the main and standby water-feeding pumps are started in an interlocking manner, and if the main and standby water-feeding pumps cannot be started in a combined manner within 3 seconds, the other standby water-feeding pump is started in a combined manner. When the main steam flow of the unit is higher than 660t/h, starting a main electric pump and a standby electric pump in an interlocking manner, and starting another electric pump in an interlocking manner after 5 s; when the steam pump fails and only one electric pump can be started in an interlocking mode, the RB is triggered to reduce the load of the unit to ensure the safety of the unit.
Description
Technical Field
The invention belongs to the technical field of control of generator sets, and particularly relates to control of the opening degree of a water feed pump.
Background
A330 MW subcritical unit and a steam drum water level control source are generally designed by three electric feed water pumps. In order to reduce the plant power consumption, the No. 1 electric pump is usually changed into a 100% steam-driven feed water pump to supply water for the boiler. When the steam-driven water-feeding pump is normally operated, the five-section steam extraction of the steam turbine provides a steam source, the auxiliary steam header is used for supplying steam during flushing, and the rest two electric water-feeding pumps are used as standby pumps. The electric water feeding pump controls the rotating speed of the electric water feeding pump through controlling the size of the spoon position so as to control the water level, and the steam-driven water feeding pump controls the water level through controlling the opening degree of the adjusting door. However, because the steam-driven feed-water pump fails in some cases, the standby electric feed-water pump cannot be started correctly in an interlocking manner; or the spoon position of the standby electric water feeding pump after interlocking can not be correctly and automatically tracked, so that the problem of unsafe is easily caused.
Disclosure of Invention
The invention provides a control method for jointly starting a steam-driven feed pump and a tripping electric pump of a 330MW subcritical unit, aiming at solving the problems that the control of the water level of a boiler of an existing generator set cannot realize the correct interlocking starting of a standby electric pump or the spoon position of the standby electric pump after interlocking cannot accurately track automatically.
A control method for the combined start of a steam feed pump and a tripping electric pump of a 330MW subcritical unit comprises the following steps:
the method comprises the following steps: after the steam-driven water feed pump breaks down, starting the main and standby electric water feed pumps in an interlocking manner, judging whether the main and standby electric water feed pumps are started successfully or not, if so, executing a step two, otherwise, executing a step three;
step two: judging whether the main steam flow of the unit is less than or equal to 660t/h, if so, successfully starting the main and standby electric feed pumps, and if not, executing a fourth step;
step three: starting the auxiliary standby electric water feeding pump in an interlocking manner after 3 seconds, judging whether the auxiliary standby electric water feeding pump is started successfully or not, if so, executing a fifth step, otherwise, tripping and stopping the unit, and failing to start the auxiliary standby electric water feeding pump in an interlocking manner;
step four: 5 seconds later, starting the auxiliary standby electric water-feeding pump in an interlocking manner, judging whether the auxiliary standby electric water-feeding pump is started successfully or not, if so, successfully starting the auxiliary standby electric water-feeding pump in the interlocking manner, otherwise, executing a sixth step;
step five: judging whether the main steam flow of the unit is less than or equal to 660t/h, if so, successfully starting the auxiliary standby electric water-feeding pump, and otherwise, executing a sixth step;
step six: and triggering auxiliary machine fault load reduction until the load is reduced to 520t/h, and eliminating the auxiliary machine fault load reduction signal.
Further, the method also comprises a spoon position tracking method of the standby electric feed water pump, and specifically comprises the following steps:
when the steam-driven feed water pump is operated and the main steam flow of the unit is more than 660t/h, the spoon position tracking function of the standby electric feed water pump is F1(x), and the function F1(x) is a broken line formed by the following coordinate points: (0,20), (300,30), (455,35), (660,50), (757,58), (850,60), (910,64), (940,65), (1000, 65);
when the steam-driven feed water pump operates and the main steam flow of the unit is less than or equal to 660t/h, the spoon position tracking function of the standby electric feed water pump is F2(x), and the function F2(x) is a broken line formed by the following coordinate points: (0,30), (303,40), (454,50), (545,60), (660,65), (1000, 65);
the x is the main steam flow of the unit;
when the steam-driven water feeding pump is tripped and only one standby electric water feeding pump operates, the spoon position tracking state of the other standby electric water feeding pump is the electric pump spoon.
The invention has the following effects:
1) when the steam pump is tripped due to faults, the standby electric pump can be started correctly in an interlocking manner; if the RB is triggered when it cannot properly start up at high load.
2) The correct tracking of the spoon position enables the standby electric pump to control the water level timely and accurately when the standby electric pump is started jointly, and the safety of unit operation is guaranteed.
Drawings
Fig. 1 is a flow chart of a control method for jointly starting a steam feed pump and a tripping electric pump of a 330MW subcritical unit according to the invention.
Detailed Description
The first embodiment is as follows: referring to fig. 1, the embodiment is specifically described, and the control method for jointly starting the steam feed water pump and the trip electric pump of the 330MW subcritical unit in the embodiment includes the following steps:
the method comprises the following steps: after the steam-driven water feed pump breaks down, starting the main and standby electric water feed pumps in an interlocking manner, judging whether the main and standby electric water feed pumps are started successfully or not, if so, executing a step two, otherwise, executing a step three;
step two: judging whether the main steam flow of the unit is less than or equal to 660t/h, if so, successfully starting the main and standby electric feed pumps, and if not, executing a fourth step;
step three: starting the auxiliary standby electric water feeding pump in an interlocking manner after 3 seconds, judging whether the auxiliary standby electric water feeding pump is started successfully or not, if so, executing a fifth step, otherwise, tripping and stopping the unit, and failing to start the auxiliary standby electric water feeding pump in an interlocking manner;
step four: 5 seconds later, starting the auxiliary standby electric water-feeding pump in an interlocking manner, judging whether the auxiliary standby electric water-feeding pump is started successfully or not, if so, successfully starting the auxiliary standby electric water-feeding pump in the interlocking manner, otherwise, executing a sixth step;
step five: judging whether the main steam flow of the unit is less than or equal to 660t/h, if so, successfully starting the auxiliary standby electric water-feeding pump, and otherwise, executing a sixth step;
step six: and triggering auxiliary machine fault load reduction until the load is reduced to 520t/h, and eliminating the auxiliary machine fault load reduction signal.
In the embodiment, the unit safety is ensured through the correct starting sequence of the two standby electric water feeding pumps and the interlocking processing mode after the starting failure. The RB function is an abbreviation of slave failure load reduction (runnack). When the fault tripping of the main auxiliary machine of the unit causes the actual power of the unit to be limited (the coordination control system is in an automatic state), in order to adapt to the output of the equipment, the coordination control system forcibly reduces the load of the unit to a load target value which can be born by the auxiliary machine which is still running. This function of the coordinated control system is called slave failure load reduction (runnack), RB for short, and a test for checking this function is RB for short.
The second embodiment is as follows: the embodiment further describes a control method for jointly starting a steam-driven feed pump and a tripping electric pump of a 330MW subcritical unit in a first embodiment, and the embodiment further includes a spoon position tracking method for a standby electric feed pump, wherein when the electric pump is put into an interlocking mode, a spoon position is in a tracking state, specifically:
when the steam-driven feed water pump is operated and the main steam flow of the unit is more than 660t/h, the spoon position tracking function of the standby electric feed water pump is F1(x), and the function F1(x) is a broken line formed by the following coordinate points: (0,20), (300,30), (455,35), (660,50), (757,58), (850,60), (910,64), (940,65), (1000, 65);
when the steam-driven feed water pump operates and the main steam flow of the unit is less than or equal to 660t/h, the spoon position tracking function of the standby electric feed water pump is F2(x), and the function F2(x) is a broken line formed by the following coordinate points: (0,30), (303,40), (454,50), (545,60), (660,65), (1000, 65);
the x is the main steam flow of the unit;
when the steam-driven water feeding pump is tripped and only one standby electric water feeding pump operates, the spoon position tracking state of the other standby electric water feeding pump is the electric pump spoon.
In the embodiment, the control strategy of the steam-driven feed pump enables the spoon position of the standby electric pump to be tracked more scientifically and reasonably, and the spoon pipe positions corresponding to different main steam flows are obtained through experiments to ensure that the water level can be accurately controlled in time when the standby electric pump is started in a combined mode, so that the rapidity and the accuracy of water level control are guaranteed.
Claims (2)
1. A control method for the combined start of a steam feed pump and a trip electric pump of a 330MW subcritical unit is characterized by comprising the following steps:
the method comprises the following steps: after the steam-driven water feed pump breaks down, starting the main and standby electric water feed pumps in an interlocking manner, judging whether the main and standby electric water feed pumps are started successfully or not, if so, executing a step two, otherwise, executing a step three;
step two: judging whether the main steam flow of the unit is less than or equal to 660t/h, if so, successfully starting the main and standby electric feed pumps, and if not, executing a fourth step;
step three: starting the auxiliary standby electric water feeding pump in an interlocking manner after 3 seconds, judging whether the auxiliary standby electric water feeding pump is started successfully or not, if so, executing a fifth step, otherwise, tripping and stopping the unit, and failing to start the auxiliary standby electric water feeding pump in an interlocking manner;
step four: 5 seconds later, starting the auxiliary standby electric water-feeding pump in an interlocking manner, judging whether the auxiliary standby electric water-feeding pump is started successfully or not, if so, successfully starting the auxiliary standby electric water-feeding pump in the interlocking manner, otherwise, executing a sixth step;
step five: judging whether the main steam flow of the unit is less than or equal to 660t/h, if so, successfully starting the auxiliary standby electric water-feeding pump, and otherwise, executing a sixth step;
step six: and triggering auxiliary machine fault load reduction until the load is reduced to 520t/h, and eliminating the auxiliary machine fault load reduction signal.
2. The control method for the steam-driven feed pump and the trip electric pump of the 330MW subcritical unit according to claim 1, further comprising a scoop position tracking method of a standby electric feed pump, specifically:
when the steam-driven feed water pump is operated and the main steam flow of the unit is more than 660t/h, the spoon position tracking function of the standby electric feed water pump is F1(x), and the function F1(x) is a broken line formed by the following coordinate points: (0,20), (300,30), (455,35), (660,50), (757,58), (850,60), (910,64), (940,65), (1000, 65);
when the steam-driven feed water pump operates and the main steam flow of the unit is less than or equal to 660t/h, the spoon position tracking function of the standby electric feed water pump is F2(x), and the function F2(x) is a broken line formed by the following coordinate points: (0,30), (303,40), (454,50), (545,60), (660,65), (1000, 65);
the x is the main steam flow of the unit;
when the steam-driven feed water pump is tripped and only one standby electric feed water pump operates, the spoon position tracking state of the other standby electric feed water pump is the electric pump spoon position of the operating electric feed water pump.
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| CN113531513B (en) * | 2021-07-28 | 2023-05-02 | 哈尔滨沃华智能电力技术有限公司 | Protection method of drum water level control system in case of failure of steam inlet valve of steam feed pump |
| CN113565575B (en) * | 2021-08-16 | 2023-03-28 | 京能十堰热电有限公司 | Boiler wall temperature protection assessment and control method for steam pump fault combined electric pump |
| CN113883033B (en) * | 2021-09-26 | 2023-04-11 | 苏州热工研究院有限公司 | Pump tripping logic control method for electric feed pump of nuclear power plant CPR1000 unit |
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| JPH102506A (en) * | 1996-06-12 | 1998-01-06 | Toshiba Corp | Feed water pump control device |
| CN103791485B (en) * | 2014-02-28 | 2015-04-22 | 国家电网公司 | Optimal control method of water supply system of thermal power generating unit |
| CN104214760B (en) * | 2014-08-26 | 2015-12-09 | 福建省鸿山热电有限责任公司 | The overcritical condensation power generation thermal power plant unit separate unit heat pump tripping operation electric pump connection of taking out of 600MW opens the control method of not cutting heat supply |
| CN108561300A (en) * | 2018-03-29 | 2018-09-21 | 中国神华能源股份有限公司 | Feed pump operation method and system |
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